DANNY1977W

Hi i had a 535d few years back but had to sell,, got a van for work,, but now as a stop gap ive gone to a 530D its straight piped 3" decat thru but has standard back box! ive heard some 530ds that have had work and love that coo from exhaust after acceleration? mine doesnt do it how can i get this tone,, as said had decat straight pipe, egr and swirls done,, any help be appreciated.... 2003 53